Advertisements
Advertisements
प्रश्न
Answer the following in detail.
Define friction and explain how it is useful to us.
Advertisements
उत्तर
Friction is a force that opposes relative motion between two bodies/surfaces in contact with each other. Although friction opposes the motion, it also makes motion possible.
Friction helps us do many things like :
- It helps us in walking. In the absence of friction, we may slip or M.
- Cars and buses are able to move safely on roads due to the friction between the treaded tires of these vehicles and the surface of the road.
- Friction allows us to hold objects with our hands.
- It allows us to write on paper.
- Friction produces heat. In winter, when we rub our cold hands, the heat produced due to friction makes our hands warm.
APPEARS IN
संबंधित प्रश्न
Friction depends on the ______ of surfaces.
A charged glass rod attracts a charged plastic straw.
Fill in the blank.
We use ball bearings to .................. the friction.
What is the cause of friction?
Give three examples to illustrate that friction is a necessary evil.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Tick the most appropriate answer
Friction always
Fill in the blank.
Rolling friction is ........... than sliding friction.
Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
Friction depends on the ______ of two surfaces in contact.
